/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.anywide.dawdler.serverplug.db.dao;

import java.util.Map;
/**
 * 
 * @Title:  DAOFactory.java   
 * @Description:    TODO   
 * @author: jackson.song    
 * @date:   2007年04月15日       
 * @version V1.0 
 * @email: suxuan696@gmail.com
 */
public class DAOFactory {
	private Map<Class<SuperDAO>,SuperDAO> daos = null;
	private static DAOFactory daofactory = null;

	private DAOFactory() {
		daos = new java.util.concurrent.ConcurrentHashMap<Class<SuperDAO>,SuperDAO>();
	}

	public static synchronized DAOFactory getInstance() {
		if (daofactory == null)
			daofactory = new DAOFactory();
		return daofactory;
	}

	public <T extends SuperDAO> SuperDAO getDAO(Class<T> ckass) {
		SuperDAO object = daos.get(ckass);
		if (object != null)
			return object;
		try {
			object = ckass.newInstance();
		} catch (InstantiationException e) {
			return null;
		} catch (IllegalAccessException e) {
			return null;
		}
		daos.put((Class<SuperDAO>) ckass, object);
		return object;
	}
}
